Visible light from a distant star can be spread into a spectrum by using a glass prism or ________
A) a telescope B) a flat glass mirror
C) a diffraction grating D) adaptive optics
C
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Star A has an apparent magnitude = 3 and star B has an apparent magnitude = 5. Which star is brighter in our sky?
A) Star A B) Star B C) There is not enough information to answer the question. D) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons
Mass Radius Orbital Radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The orbital period of Moon B is closest to A) 5.6 × 106 s. B) 6.0 × 106 s. C) 6.4 × 106 s. D) 6.9 × 106 s. E) 7.3 × 106 s.
On the graphs shown, you can identify an ice age by looking for __________.
A. a trough (bottom of a dip) on the temperature graph B. a peak on the temperature graph C. a trough (bottom of a dip) on the carbon dioxide graph D. a place on the temperature graph where the temperature curve falls steeply
Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years
A) 3 × 109 beats B) 3 × 108 beats C) 3 × 1010 beats D) 3 × 107 beats